Radio apparatus



Jan. 12, 1937. E HAND 2,067,395

RADIO APPARATUS Original Filed July 9, 1930 INVENTOR ERLE H. HAND I Tnomcv Patented Jan. 12, 1937 I PATENT OFFICE RADIO APPARATUS Erle H. Hand, New York, N. Y., assignor to Radio Corporation of America, a corporation of Delaware Original application July 9, 1930, Serial No. 466,680. Divided and this application February 14, 1935, Serial No. 6,496

8 Claims.

This invention relates to radio apparatus and has for an object to provide means for easily and quickly changing the coils of a radio set to adapt it for use on different groups of wave lengths. This application is a division of my United States application Ser. No. 466,680, filed July 9, 1930, which resulted in U. S. Pat.

Heretofore, in sets designed for use on different groups of wave lengths, it has been necessary manually to remove the coils from their sockets and insert other coils when it was desired to change the set from one group of wave lengths to another group of wave lengths.

According to the present invention, the removal of the coils from their sockets and the insertion of other coils in such sockets is avoided. Coils for the difierent groups of wave lengths are mounted on a. carrier and means are provided to actuate the carrier to connect in the circuits of the radio set, the proper coils to adapt the set. for use with the desired groups of wave lengths. 'The coils, after once being mo inted on the carrier, do not have to be touched and are connected or disconnected from the circuits merely by actuation of the carrier.

Other objects, novel features and advantages of this invention will be apparent from thereilowing specification and accompanyingdrawing, wherein:

Fig. 1 is a plan view partly in section illustrating an inductance changing device arranged in accordance with the present invention.

Fig. 2 is a section on the line 88 of Fig. 1.

Fig. 3 is a section on the line 9-9 of Fig. 1, and

Fig. 4 is a perspective view of a portion of the apparatus.

Referring now to Figs. 1- to 4 inclusive, is a carrier upon which are supported transformer coils 5! for different groups of wave lengths,

these coils being coaxial. The carrier 50 is supported by a shaft 52 pivoted in the ends of a cylindrical metallic casing 53 surrounding the carrier and being supported by brackets 54. Each coil is provided with a plurality of terminals 55, the terminals for each coil being uniformly spaced and the terminals for successive coils being uniformly ofiset. A plurality of brackets 56 of insulation are supported, as shown in; Figs. 1 and 3, within the casing 53 and extend axially of the carrier 50. Each of these brackets is provided with a set of serially connected contact members 51, each set being connected with one of the leads to the radio set.

ofiset arrangement of the terminals of the different coils. Each contact member 51 is provided with a notch 51a to receive the end of the terminal 55, thereby resiliently locking the carrier. Rotation of the carrier 50 thus is effective to connect the desired wave length coils in the radio circuit.

A worm wheel 58 is connected to one end of the shaft 52 and meshes with a worm gear 59 mounted on a shaft 60 journalled in brackets 6| supported by the base plate 62 which likewise supports the brackets 54. A panel 63 is provided in front of one of the brackets 6i and the shaft 60 extends through this panel and is provided with a knob 64. The shaft 60 carries a pinion 65 which meshes with a gear 66 mounted on the shaft 61 supported by the bracket 6|. A dial 68 is rotatable with the gear 66 and is visible through a window in the panel 63. Indicia are provided on the dial 68 to indicate which coil is connected in the radio circuit.

' The carrier 50 may be rotated to connect or disconnect from. the radio circuits various coils 51, this rotation being effected by means of the knob 64. The indicia on the dial 68 indicate the selected coil and the contact members 51 serve to hold the carrier against accidental rotation.

The modification disclosed in Figs. 1 to 4 inclusive is designed primarily for radio sets utilizing but a single coil, however, it is apparent that this arrangement may be utilized in sets having two coils. Furthermore, it is to be understood that various modifications may be made in the device above described, without in any way departing from the spirit of the invention as defined in the appended claims.

What is claimed is:

1. In an inductancechanging system, a rotatable form, a plurality of inductances supported in axially spaced relation on said form, contacts on said form connected with each of said inductances, fixed contacts adjacent said form, and means for moving said form to make contact between said fixed contacts and selected ones of said contacts on said form.

2. In an inductance changing system, an elongated form, a plurality of inductances mounted along said form in spaced relation, contacts on said form connected with each of said inductances, fixed contacts adjacent said form, and means for moving said form to make contact between said fixed contacts and selected ones of said contacts on said form.

3. In an inductance changing system, an e1ongated form, a plurality of sets of coupling inductances mounted along said form in spaced rela tion, a group of contacts for each set of inductances the individual contacts being staggered on the periphery of said form, fixed contacts adjacent said form, and means for moving said form to make contact between selected ones of said staggered contacts and said fixed contacts.

4. In an inductance changing system, a rotatable cylindrical form, a plurality of sets of wind ings spaced along said form, a closure member enclosing said form, contacts mounted on said form in staggered relation, groups oi said contacts being connected to the windings in each set of windings, fixed contacts mounted. on the inner periphery of said member enclosing said form, and means for rotating said form to selectively connect a selected set of said windings to said fixed contacts by way of said staggered con i tacts.

5. In an inductance changing system, a rotatable cylindrical form, a plurality of sets of transformer windings spaced along said form, a metal lic cylinder enclosing said form, contacts m0unted on the periphery of said form in staggered relation, groups of said contacts being connected to the windings in each set of wind ings, fixed resilient contacts mounted on the inner periphery of said cylinder enclosing said form, and mechanical means for rotating said form to selectively connect a selected set of said windings to said fixed contacts by way of said staggered contacts.

6. An inductance system as recited in claim 1 in which said inductances supported on said form in spaced relation are coaxialj 7. An inductance changing system as recited in claim 2 in which said inductances mounted along said form in spaced relation are coaxial.

8. An inductance changing system as recited in claim 3 in which said sets of coupling inductanccs mounted along said form in spaced relation are coaxial.

ERLE H. HAND. 

